SIW Antenna for 5G In-Band Full Duplex Applications

Abstract

Ahstract-This paper presents a microstrip fed, double differential antenna based on substrate integrated waveguide (SIW) technology for In-Band Full Duplex communication at 28 GHz. Using higher order TE201 mode of the SIW cavity and differential port excitations, the proposed antenna achieves a self-interference cancellation of better than -77 dB over a 210 MHz bandwidth and a high gain of 8.2 dBi. Occupying a miniaturized size of $7.56 \times 7.56\ \mathrm{mm}^{2}$, the antenna features a radiation efficiency of 77% and front to back ratio of 19 dB.